You know what I mean. There are always moments in movies where the main villain is laughing at something, and then all of his henchmen then also laugh along with him, superficially agreeing with him but also implicitly afraid not to laugh.
A great example of what I’m talking about is the part at 3:10 in this wonderfully-animated scene from Metal Gear Solid 3.
I also recall this happening in Star Wars with Jabba the Hutt.
You forgot to add that the villain will abruptly stop laughing, immediately adopting a sour face, and so too the henchmen must stop laughing and smiling, making it all the more uncomfortable for them.
This is one of those movie memes that happens so often I can’t think of an actual example.
Mwahh-hah-hah-hah-hah!
Mwahh-hah-hah-hah-hah!
Mwahh-hah-hah-hah-hah!
Mwahh-hah-hah-hah-hah!
erm . . . mwuh huh . . . huh
Nearly every Dr. Evil scene in an Austin Powers movie.
Wasn’t there a scene like this in Goldfinger? I seem to recall that Goldfinger has all the mobsters over to his place. They’re waiting for him, shooting pool and having drinks from his bar when he presents his plan to rob Fort Knox. Then Goldfinger laughs–and most of the mobsters laugh with him. The one who doesn’t laugh; and indeed, disagrees with Goldfinger’s plan, is invited to leave (and subsequently, shot).
Didn’t really matter; those who laughed with Goldfinger, and stayed; are gassed anyway. So much for saving your life by laughing with the villain!
Oh, the Goodfellas scene is clearly the king out of this crop.
Edit to add: NSFW for language.
In Labyrinth, the goblins suck up to Jareth that way. Particularly at 3:40, and again from 5:55 to 6:15.
The movie that immediately came to my mind was Pale Rider, where the Preacher is summoned to meet with Mr. LaHood, who is surrounded by his minions when they chat. No clip of it on Youtube but I did find the final showdown.
Doc Savage, man of bronze. Captain Seas starts laughing, and all his cohorts start along.
Sleeping Beauty. Maleficent and her minions do the laugh.
Band name!
I immediately think of Mom and her three sons on Futurama. Except instead of them stopping the laughter on their own, the henchmen are usually silenced either by verbal threats (“Cram a bastard it in you crap!”), or slaps in the face.
I loved Mom. 
Barbossa does exactly that in the 1st POTC movie; stops laughing and remonstrates his crew to get back to work.
Not exactly the same, but in Blazing Saddles we get a “Harrumph for the Governor.”
IIRC it also happens in Mom and Dad Save the World.
They do this in Cannibal! The Musical when the Packer Party confronts the trappers in the Indian camp.
Not a movie, but:
– John Webster, The Duchess of Malfi (1613)